If your iPhone won’t install a software update, it’s more than just annoying. You must install the latest updates to get security patches, as well as the latest features.
You install software updates by opening Settings > General > Software Update. It should be a pretty smooth process, but occasionally, things go wrong. The error messages can be inscrutable and infuriatingly vague.
But there are a few things you can try. Here’s a step-by-step guide that will show you what to do.